package com.itCJH.waimai6.filter;

import com.alibaba.fastjson.JSON;
import com.itCJH.waimai6.common.BaseContext;
import com.itCJH.waimai6.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;

        //1.获取本次请求的路径
        String requestURI = request.getRequestURI();

        log.info("拦截到的请求:{}",requestURI);
        //定义不要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };

        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);


        //3.如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4-1.判断登录状态，如果不放呢  则需要处理的  需要判断是否登录（即不是放行的路径 都需要处理判断） PC端登录
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户的id为:{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);


            //放行的意思
            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断登录状态，如果不放呢  则需要处理的  需要判断是否登录（即不是放行的路径 都需要处理判断） 移动端登录
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户的id为:{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);


            //放行的意思
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5.如果未登录则返回未登录的结果，通过输出流的方式向客户端页面相应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }


}
